Question: What is the dual of the facet of a polytope of the grand 120-cell ?
Paraphrase: What is the double of the aspect of a polytope of the fantastic 120-cell ?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q5594220 wdt:P1312 ?X . ?X wdt:P1322 ?answer}
Answer: regular icosahedron